AS8879D: Screw Threads - UNJ Profile, Inch Controlled Radius Root with Increased Minor Diameter

Features

Issuing Committee: E-25 General Standards for Aerospace and Propulsion Systems

Scope

Content

This SAE Aerospace Standard (AS) specifies the characteristics of screw threads - UNJ profile inch series, including a mandatory controlled radius as specified in Table 1 at the root of the external thread. The minor diameter of both external and internal threads provides a basic thread height of .5625H to accommodate the external thread maximum root radius. The following detailed design requirements are included:

a
Screw threads - UNJ basic profile and design profiles.
b
Standard series of diameter-pitch combinations for nominal thread diameters from 0.060 to 6.000 inches.
c
Standard thread classes and form tolerances.
d
Formulae for thread dimensions and tolerances.
e
Method of designating UNJ threads.
f
Tables for selected diameter-pitch combinations for close tolerance mechanical thread applications.
g
Tables for screw thread - UNJ profile thread limit dimensions.

Rationale

Content: AS8879D has been reaffirmed to comply with the SAE Five-Year Review policy.

Meta Tags

Topics: Screws

Details

DOI: https://doi.org/10.4271/AS8879D

Pages: 25

Citation: SAE International Technical Standard, Screw Threads - UNJ Profile, Inch Controlled Radius Root with Increased Minor Diameter, SAE Standard AS8879D, Reaffirmed April 2024, Revised August 2004, Issued October 1996, https://doi.org/10.4271/AS8879D.

Additional Details